Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

B&K 1077B no video - problem solved
#10

I got back into it tonight. Problem found and resolved! Sometimes it helps to take a break and think things over. It wasn't what I originally thought, in fact, I wasted a LOT of time chasing - nothing. The culprit? Open electrolytic cap! Remember, I recapped it about 5 years ago? Well, one of the new caps was dead. I clipped a sub on and things came up, so I replaced and it came back to life. I wouldn't have dreamed that one of my new caps would have failed already - but it did! Soooo - learn from my pain, just because caps are new(er), doesn't mean they are good.

C62 was the main filter on the - supply.

   

The left black capacitor in the board with the tuners over it.
   

Soldered in a replacement and it came to life.
   

This cap is DEAD!

   

I still had a bag with some left - 10uf 450v. I believe came from AES. Has the big "U" on it. I tested a few others and they were marginal, not giving a good solid reading. Tossed them in the trash.
   

The schemo showing the horizontal driver using the ICs. This is kinda hard to find, so if you need a copy, PM me and I can send or post.
   

If I could find the place called "Somewhere", I could find "Anything" Icon_confused

Tim

Jesus cried out and said, "Whoever believes in me , believes not in me but in him who sent me" John 12:44


Messages In This Thread
B&K 1077B no video - problem solved - by TV MAN - 02-11-2025, 01:26 PM
RE: B&K 1077B no video - by TV MAN - 02-11-2025, 02:03 PM
RE: B&K 1077B no video - by radiorich - 02-11-2025, 09:01 PM
RE: B&K 1077B no video - by TV MAN - 02-11-2025, 09:11 PM
RE: B&K 1077B no video - by radiorich - 02-11-2025, 11:07 PM
RE: B&K 1077B no video - by TV MAN - 02-12-2025, 12:41 AM
RE: B&K 1077B no video - by radiorich - 02-12-2025, 01:55 AM
RE: B&K 1077B no video - by TV MAN - 02-13-2025, 04:04 PM
RE: B&K 1077B no video - by radiorich - 02-13-2025, 10:59 PM
RE: B&K 1077B no video - by TV MAN - 02-15-2025, 12:40 AM



Users browsing this thread: 3 Guest(s)
[-]
Recent Posts
Value of capacitor
If this helps you sort it out just remember 10,000 mmfd or pf = .01 mfd. So 5,000mmfd = .005 mfd.Radioroslyn — 04:23 PM
Value of capacitor
OP here- the parts list calls for an .005 1000 volt mica. It currently has an .005 1000 volt electrolytic that is at lea...bridkarl — 02:09 PM
Value of capacitor
Maybe it's one of those paper caps that is wrapped in a mica-lookiing case.RodB — 01:51 PM
Value of capacitor
I also was wondering what the post about using polarized caps had to do with the subject? The cap is 5nF, does not exis...morzh — 10:22 AM
Value of capacitor
The OP stated that there is an electrolytic in the circuit in place of the coupling cap and wondered what effect it has....RodB — 09:53 AM
Value of capacitor
According to AI... ...assuming the electrolytic that's in it now is polarized... What does your response have to ...DaleHCook — 08:17 AM
Philco 50-925 antenna connections
Most loop antenna setups are either one continuous loop with two connections or 2 loops with 4 connections. The latter c...RodB — 02:16 PM
Value of capacitor
Not trying to answer for the OP, just commenting on the thread. According to AI... ...assuming the electrolytic that'...HowardWoodard — 02:09 PM
Philco 50-925 antenna connections
Hello Keith! I've updated your thread with the proper model number. Take care, - GaryGarySP — 01:10 PM
Value of capacitor
Why are you having to replace it? Does it measure out of tolerance? Is it mechanically damaged?DaleHCook — 07:50 AM

[-]
Who's Online
There are currently no members online.

>